I had a look at the various covers of Girl with a Pearl Earring by Tracy Chevalier. All the covers feature one way or the other the painting by Vermeer, not surprising really.
Here are some British or US covers, some of which have a second painting on them which is also mentioned in the book, a view of Delft. I like those best. If you would like to know more about Vermeer, his life and art, I recommend to go to Essential Vermeer. That site has – among a lot of other information – a great interactive guide to Vermeer’s paintings that explains them in great detail.
Here is a German, French and Italian one:
Undoubtedly, it won’t take very long before the first cover appears that looks like this….
Already the first covers turn up that promote the book as “now a major motion picture” (see third English one).